Composite system.



O. T. LADEMAN.

COMPOSITE SYSTEM.

-APPLIOATION FILED FEB.l5, 190 0.

949,188. Patented Feb. 15, 1910.

UNITED OFFICE.

OTTO T. LADEMAN, OF MILIVAUKEE, WISCONSIN, ASSIGNOR TO RAILWAY TELE-PHONE & ELECTRIC COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OFILLINOIS.

COMPOSITE SYSTEM.

T 0 all whom it may concern:

Be it known that I, Orro T. LannuAN, citizen of the United States,residing at Milwaukee, in the county of Milwaukee and State ofWisconsin, have invented a certain new and useful Improvement inComposite Systems, of which the following is a full, clear, concise, andexact description, reference being had to the accompanying drawings,forming a part of this specification.

My invention relates to composite systems, and is designed to facilitatecommunication over a circuit, both for telephonic and telegraphicappliances.

My invention more particularly contemplates the provision of a pluralityof metallic telephone circuits placed end to end, electrically speaking,having telegraphic appliances interposed between these various telephonecircuits.

This invention will be more clearly understood by reference to theaccompanying drawing, illustrating the preferred embodiment thereof.

I have here shown three metallic telephone circuits, consistingrespectively of the two conductors a, Z), a. Z), and (1?, 5 Thesemetallic telephone circuits are provided with reactive devices whichjoin the ends of the conductors condiustively, but which, on account oftheir high reactive effect, are sufficient to prevent injuriousdeflection of telephonic currents from the metallic line conductorsaforesaid.

I have shown telephone instruments (Z, (Z, indicated by circlesthroughout the various metallic telephone circuits, one of thesetelephone sub-station sets, however, bein shown in detail at the lefthand end of the metallic circuit a, Z). Any suitable sub-station set maybe used, and the one herein illustrated consists of the transmitter c,induction coil f, condenser g, battery It, generator 2', local signal j,switch-hook 7c, and receiver Z, properly arranged in this instance formetallic transmission in bridge with the line conductors a, b.

It will be seen that the impedance coils 0 define the limits of thevoice currents, confining them to the metallic conductors a, Z), or a,Z), or a b as the case may be. Thus there are provided three differenttelephone systems along a railway right-of-way, for instance, whichtelephones are placed preferably at the less important stations. MoreSpecification of Letters Patent.

Application filed February 15, 1909.

. 'atented Feb. .15, 1910.

Serial No. 478,072.

important stations are designed to occur where the respective metalliccircuits end, and at these more important stations, there are providedtelephone sets capable of communicating over the two metallic circuitsentering said station, and in addition, telegraphic appliancesconsisting of the relays m, keys n, and short circuiting switch 0. Thesetelegraphic appliances are preferably connected between the centralportion of the impedance devices 0, thus forming a circuit, using boththe line wires a, Z), the line wires 6:, Z), and the line wires (4, 7%,in parallel with the ground, in this instance, as a return circuit. Thetelegraphic appliances at the ends of their complete circuits aregrounded at p. The battery 8 is inserted in the telegraphic circuit, asis well understood.

It will be seen from what has thus far been described that there are avariety of metallic telephone circuits arranged end to end, withtelegraphic devices interposed between these metallic sections and attheir respective ends, thus permitting of telegraphic communicationthroughout the cntire length of the metallic circuits, and at the sametime permitting telephonic communication metallically between thetelephonic devices. Thus, for instance, the teleg 'aphic signals aresent to the more important stations, and then those intended for theless important stations are sent on by telephone by the operators at themore important stations. It may happen, however, that the station at theextreme left of the circuit a, 7), (which, for instance, I will call thedespatchers telephone station) may desire to communicate directly on thetelephone on the circuit a, b, or on the circuit (2?, b and toaccomplish this result, I apply at the various stations havingtelegraphic appliances, a repeating coil t, which, by reason of theswitch a, and condensers c, serves to connect the adjoining telephoniccircuits together. The repeating coil t may, of course, be replaced bycondensers w, w, if desired. It will thus be seen that telephoniccommunication can be carried on throughout the entire length of thethree circuits, if desired.

While I have herein shown and particularly described the prcferredembodiment of my invention, I do not wish to limit myself to the preciseconstruction and arrai'igement as herein set forth, but

Having thus set forth its most salient features, what I claim as new anddesire to secure by Letters Patent is:

1. A composite system of telephony and telegraphy consisting of severalindependent metallic telephone circuits arranged end to end, telephonesets metallically arranged with said circuits, reactive means associatedwith said circuits to establish a telegraph circuit using the twoconductors of each metallic circuit in parallel and a return circnit,telegraph instruments interposed in said telegraphic circuit betweensaid me tallic telephone circuits, and switching means and a repeatingcoil for telephonically connecting the various metallic telephonecircuits.

2. A composite system of telephony and telegraphy consisting of severalindependent metallic telephone circuits arranged end to end, telephonesets metallioally arranged with said circuits, reactive means associatedwith said circuits to establish a telegraph circuit using the twoconductors of each metallic circuit in parallel and a return circuit,telegraph instruments interposed in said telegraphic circuit betweensaid metallic telephone circuits, and switching means for establishingcircuits telephonic-ally connecting the various metallic telephonecircuits, said circuits being opaque to telegraphic currents.

In Witness whereof, I hereunto subscribe my name this 19th day ofJanuary A. D., 1909.

OTTO T. LADEMAN.

lVitnesses MAX V. ZABEL, O. M. WENNIEL.

